No Purpose without God

I'm debating a strong evangelical at work, and I've got him pinned to his strongest reason for belief: that there would be no purpose to his life without god. Of course I know that isn't true, but I want to respond to this thoughtfully. How would you respond to the statement there is no purpose without God?

Thanks Gaytor. I actually did a search on purpose, but didn't find what I was looking for. I figured it was already there and I just didn't pose the question well. Obviously, TA members still have more to contribute to this subject. Thanks all!

And how exactly the existance of a God help him finding a purpose..was he born to pray andd go to church?? is that it??

I remember a quote by Einestein that says the only meaning and purpose of our life is to make those around us happy.

He said exactly " Strange is our situation here on Earth. Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose. From the standpoint of daily life, however, there is one thing we do know: that man is here for the sake of other men - above all for those upon whose smiles and well-being our own happiness depends"

Wow, that's no debate card to pull at all. The mere statement is a surrender.
If he has arrived at that sad excuse for his belief, then he admits plainly that God is a creation, a solution --only to appease a question mankind has always had, and nothing more. His next step is to understand that life is full of unanswerable questions -- we're a dot on the map, he probably hasn't got a mind big enough to imagine how small we are, and how small our silly sentiments and ideas of gods are... I'd ask how he can possibly think belief is justifiable by the idea than mankind needs to, or possibly could know everything. We can't, and it's a total embarrassment, but common human "thing," to just make shit up as we go to calm and reassure everyone. We make our own purposes, we arrived by chance, by pure, unbiased, evidential evolution, no matter what legends we've written since our debut, and now that we are here, there are tons of purposes to undertake. Maybe he could start with the business of saving Earth, since our ancestors left us not only an irreversible situation of religion and all its burdens and fights, but a situation of having unknowingly started killing our own one true nonhuman parent, the planet.
Having some huge personal purpose... seems pretty damn petty to me, petty like a lot of their "God's" wishes and demands of us.

I am sad that man has no purpose in his life without god. Have you suggested he get a pet or try one of those nice online dating services? Perhaps he should strive for an altruistic pursuit, like volunteering somewhere?